JPH0546114U - Graphic equalizer circuit - Google Patents

Abstract

(57) [Abstract] [Purpose] The present invention is to adjust the frequency bands and signal levels of a graphic equalizer of a plurality of channels easily and in a short time by a rotary encoder. [Structure] A band operation key for setting an adjustment band from frequency bands of a plurality of channels, a level operation key for setting a signal level of this frequency band, and a rotary encoder for sending operation data to a microcomputer are provided. It is configured to control the circuit.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a graphic equalizer circuit using an electronic volume circuit, and more particularly to a graphic equalizer circuit suitable for adjusting a frequency band (band) and a signal level of the graphic equalizer.

[0002]

[Prior art]

 Conventionally, many graphic equalizer (hereinafter simply referred to as “glyco”) circuits using an electronic volume circuit have been provided in the block diagram of FIG. 4 and the panel diagram of the main part of FIG. In the figure, reference numeral 1 is an input terminal for an audio signal of a plurality of channels divided into a plurality of frequency bands, and this audio input signal is set with a signal level of each channel by an electronic volume circuit 2 composed of a plurality of electronic volumes. And output to the output terminal 3.

Reference numeral 7 denotes a microcomputer (hereinafter, simply referred to as a microcomputer). As is well known, the microcomputer 7 is basically composed of a CPU 7b, ROM7d, RAM7c, an input port 7a, an output port 7e, etc. A program for controlling the CPU7b is written in, and the CPU7b fetches the operation data of the band cursor key 20 and the level cursor key 21 connected to the input port 7a according to this program, or exchanges the data with the RAM7d. The data is transmitted and received to perform arithmetic processing, and the arithmetic processing data is output from the output port 7e to the electronic volume circuit 2 and the graphic display 8.

Reference numeral 22 denotes a panel of the device, and as shown in the figure, the band cursor key 20 and the level cursor key 21 are displayed on the panel 22, for example, "<", ">" and "∨", "∧" marks. It is mounted as an operation key, and a graphic display 8 is mounted so that the signal level is divided and displayed for each frequency band as shown in the figure.

When setting the frequency characteristic of the glyco circuit thus configured, the band cursor key 20 is pressed to set the frequency band, and further the level cursor key 21 is pressed to set the signal level. Each time the band and level cursor keys 20 and 21 are operated, the set value is moved in the direction of the arrow of the key by one step each time it is pressed. Was.

[0006]

[Problems to be solved by the device]

 However, the adjustment of the setting value of the conventional graphic circuit described above is performed by adjusting the band and level cursors using multiple frequency bands and multiple step signal levels (for example, 10Ch band and level values from -12dB to + 12dB as shown in the figure). Since the keys 20 and 21 are pressed to set one step at a time, an extremely large number of pressing operations are required, and the operation time is long.

The present invention has been made in view of the above points, and an object of the present invention is to solve the drawbacks of the conventional example and to easily and quickly determine the frequency band and the signal level of the glyco by using the rotary encoder in a short time. It is in the area of providing a graphic circuit that can be adjusted.

[0008]

[Means for Solving the Problems]

 The graphic circuit of the present invention comprises an electronic volume circuit for setting frequency characteristic curves of a plurality of channels, a microcomputer for controlling the electronic volume circuit, and an operation device for transmitting operation data to the microcomputer. A band operation key for setting the frequency band of the channel and a level operation key for setting the level of this frequency band are provided, and the operation device for transmitting the above operation data is formed by a rotary encoder.

[0009]

[Action]

 According to this invention, the electronic volume circuit for setting the frequency characteristic curves of a plurality of channels can be controlled by setting the band operation key and the level operation key of the microcomputer and operating the rotary encoder of the operation device.

When the band operation key provided on the panel surface is pressed to set the frequency band of the glico, the microcomputer sets the graphic circuit to the frequency band adjustment mode and sets the frequency band easily by rotating the rotary encoder. be able to. Similarly, when the level operation key on the panel surface is pressed, the graphic circuit enters the signal level adjustment mode, and the signal level can be easily set by rotating the rotary encoder.

As described above, since the adjustment by the rotary encoder can adjust all the frequency bands and the signal level values by one rotation operation, the adjustment can be easily performed by one-touch operation and the adjustment time is short. Can be done at.

[0012]

【Example】

 An embodiment of the glyco circuit according to the present invention will be described with reference to FIGS. FIG. 1 is a block diagram, FIG. 2 is a panel diagram of a main part, and FIG. 3 is a flowchart showing the operation. The same parts as those of the conventional example are designated by the same reference numerals and the description thereof will be omitted.

In the figure, 4 is a band operation key connected to the microcomputer 7, 5 is a level operation key connected to the microcomputer, and 6 is a rotary encoder for adjusting the frequency band and the signal level. Reference numeral 10 is a panel on which the band and level operation keys 4 and 5 and the rotary encoder 6 are mounted.

As described above, electronic channels (not shown) of a plurality of channels of the electronic volume circuit 2 are controlled by the operation data from the band and level operation keys 4 and 5 of the microcomputer 7 and the rotary encoder 6, and each channel of the graphic is controlled. The operation of adjusting the frequency characteristic curve of will be described with reference to the flowchart of FIG.

To adjust the glyco characteristic of the audio device, set the device to the glyco mode and operate the band operation key 4 on the panel 10 surface (step S1), and the glyco circuit enters the frequency band adjustment mode (step S3). The adjustment of the rotary encoder 6 in this frequency band adjustment mode is a frequency band setting function.

In this way, the operation data of the rotary encoder 6 is transferred to the electronic volume circuit 2 by turning the rotary encoder 6 in the frequency band adjustment mode state and rotating the rotary encoder 6 (step S6). (Step S10), the frequency band of the glyco displayed on the glyco display 8 can be set.

In the above rotary operation of the rotary encoder 6, for example, when the rotary encoder 6 is rotated in the direction of arrow A, the frequency band setting on the graphic display 8 can be moved in the direction of arrow B and adjusted. The frequency band setting can be adjusted by moving in the direction opposite to the arrow B direction by rotating (reversing the direction of arrow A). If the frequency band setting value is at the leftmost end (1Ch), the rotary encoder 6 can be rotated in the opposite direction of arrow A to move the frequency band setting value to the rightmost end (10Ch).

As described above, after adjusting the frequency band, the signal level of this frequency band is adjusted by operating the level operation key 5 of the panel 10 (step S4), and the graphic circuit enters the signal level adjustment mode (step S5). ) When the rotary encoder 6 is rotated in the direction of arrow A in this signal level adjustment mode (step S6), this operation data is transferred to the electronic volume control circuit 2 (step S10), and the level of the graphic display 8 is set. The set value can be adjusted by moving in the direction of arrow C.

When the rotary encoder 6 is rotated in the opposite direction of arrow A (step S6), data is transferred to the electronic volume circuit 2 (step S10), and the signal level value is changed in the opposite direction of arrow C (minus direction). Can be moved and adjusted.

In this way, when the frequency band and signal level of one channel are set by the rotary operation of the rotary encoder 6, the frequency band and signal level of the next adjustment channel are sequentially and repeatedly adjusted by the same procedure as described above. You can

After setting the frequency band adjustment mode (step S3) or the signal level adjustment mode (step S5), if the rotary encoder 6 is not rotated (step S6), the microcomputer 7 has a built-in 5 seconds. When the timer starts (step S7), the rotary encoder 6 does not rotate during these 5 seconds (step S8), and the timer times out for 5 seconds (step S9), the glyco circuit does not have the glyco adjustment. And return the device to the initial state.

As described above, since the frequency band and the signal level of the graphic circuit can be adjusted by the rotary encoder 6 for each channel, for example, when the rotary operation range of the rotary encoder 6 is set to 300 degrees, the knob of the rotary encoder 6 is adjusted. All adjustments can be made by rotating the 300 degrees, and the operation becomes easier and the operability of adjustment can be improved.

[0023]

[Effect of the device]

 As described above, the graphic circuit according to the present invention can adjust the frequency band and the signal level by the rotary operation of the rotary encoder, so that the conventional complicated graphic frequency characteristic curve adjustment operation can be easily performed. The effect is that adjustment can be performed in a short time.

In particular, in the case of an in-vehicle audio device, the installation location of the device is small and it is difficult to perform the graphic adjustment work. However, there is also an effect that the rotational operation of the rotary encoder allows extremely easy adjustment even in the in-vehicle audio device. is there.

Moreover, it has excellent features such as a simple structure and easy implementation because it can be constructed at low cost.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of a glyco circuit according to the present invention.

FIG. 2 is a panel view showing a panel surface of a main part of the present invention.

FIG. 3 is a flowchart explaining the operation of the present invention.

FIG. 4 is a block diagram of hardware showing a conventional example.

FIG. 5 is a panel view of a main part of a conventional example.

[Explanation of symbols]

 1 Audio signal input terminal 2 Electronic volume circuit 3 Glyco circuit output terminal 4 Band operation key 5 Level operation key 6 Rotary encoder 7 Microcomputer 8 Glyco display 10 Panel

Claims (1)

[Scope of utility model registration request] 1. A graphic equalizer circuit comprising: an electronic volume circuit for setting frequency characteristic curves of a plurality of channels; a microcomputer for controlling the electronic volume circuit; and an operating device for sending operation data to the microcomputer. A graphic equalizer characterized in that a band operation key for setting a frequency band of a plurality of channels and a level operation key for setting a signal level of this frequency band are provided, and an operation device for transmitting the operation data is formed by a rotary encoder. circuit.